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A bacterial dynamin-like protein.

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This summary is machine-generated.

Researchers reveal the crystal structure of a bacterial dynamin-like protein (DLP), uncovering its mechano-chemical functions and similarities to chloroplast dynamins, which challenges evolutionary origins.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Dynamins are essential mechano-chemical GTPases in eukaryotes, crucial for processes like endocytosis.
  • High-resolution structural data for dynamins has been limited, hindering mechanistic studies.
  • Bacterial GTPases with dynamin-like protein (DLP) architecture are predicted but poorly characterized.

Purpose of the Study:

  • To determine the high-resolution crystal structure of a cyanobacterial DLP.
  • To investigate the structural and mechanistic properties of bacterial DLPs.
  • To explore the evolutionary relationship between bacterial and eukaryotic dynamins.

Main Methods:

  • X-ray crystallography was used to obtain the structure of a cyanobacterial DLP in nucleotide-free and GDP-bound states.
  • In vitro assays assessed the DLP's ability to self-assemble and tubulate lipid bilayers.
  • In vivo localization studies were performed to compare its membrane association with known proteins.

Main Results:

  • The crystal structure revealed a conserved multidomain architecture similar to eukaryotic DLPs.
  • The cyanobacterial DLP demonstrated helical self-assembly and lipid tubulation capabilities.
  • In vivo, the bacterial DLP localized to membranes similarly to chloroplast-specific dynamin-related proteins.

Conclusions:

  • The bacterial DLP possesses functional and structural characteristics akin to eukaryotic dynamins.
  • Structural insights into bacterial DLPs may inform studies across the entire dynamin superfamily.
  • The striking similarity between cyanobacterial and chloroplast DLPs suggests a potential shared evolutionary origin, questioning current models of dynamin evolution.